Blank holder



BLANK HOLDER Filed Feb' 18, 1922 e sheets-shea 1 V@la i Nov. 24, 1925 R.W. GLASNER ET AL BLANK HOLDER Filed Feb. 18, 1922 6 Sheets-Sheet 2 R. W.GLASNER ET'AL BLANK HOLDER Filed Feb. 18. 1922'v 6 Sheets-Sheet 3 mw mw0.

Nov. 24 1925., 1,562,953

R. W. GLASNER ET AL BLANK HOLDER Filed Feb, 18. 1922 '6 Sheets-Sheet 4ff Mr/@zy Nov. 24, 1925`- R. w. GLASNER ET Al.

BLANK HOLDER 6 Sheets-Sheet 5 Filed Feb' 18. 1922 *Ein/@mwa IIIIII H H wmw W W FWHM@ n lillumini 6 647%.

R. W. GLASNER ET AL.'

Nov. 24 1925.

BLANK HOLDER Filed Feb. 18, 1922 '6 Sheets-Sheet 6 Patented Nov.. 24,19.25.

UNITED STATES PATENT OFFICE.

RUDOLPH W. GLASNER AND OLOF ce NILsoN, OF CHICAGO, ILLINOIS, AssIGNoRs'ro MARQUETTE TOOL @L MANUFACTUMNG COMPANY, or CHICAGO, ILLINOIS, A COR-PORATION OF ILLINOIS.

BLANK Application lcd. February To all whom 'it may concern.'

lle it known that we, RUDOLPH W. GLAS- Nnn and OLor G. NILsoN, citizensof the United States, residing at Chicago, in the county of Cook andState of Illinois, have invented certain new and useful Improvements inBlank Holders, of which the following is a specification.

This invention relates to improvements in blank holders particularlyadapted, though not necessarily limited in its use with sheet metalpresses.

One of the objects of the invention is to provide improved means wherebya Single acting press may be readily converted into a double acting`press.

A further object is to provide improved means whereby a double acting'press may be readily converted. into a triple actingD n'ess. l To theattainment of these ends and the accomplishment of other new and usefulobjects as will appear, the invention consists in the features ofnovelty in substantially the construction, combination and arrangementot the several parts hereinafter more fully described and claimed andshown in the accompanying drawings illustrating' this invention and inwhich Figure 1 is a front elevation of a portion of;- a single actingpress'having this improved blanh holder applied thereto the shapingmember being omitted.

Figure. 2 is a vertical sectional view as taken on line 2-2, Figure 1.

Figure 3 is a detail view as taken on line 8MS. Figure 1.

Figure 4 is a vertical sectional view ot' a portion of a double acting`press having a blank holder constructed in accordance with theprinciples of this invention, applied thereto.

Figure 5. is a view taken on vline 5-5, Figure 4.

Figure 6 is a view in elevation of a portion of Figure.

Figure 7 is a view partly in vertical section and partly in elevationshowing' anotherl lorm of the invention.

Figure 8 is a detail sectional view on line Sufi. Figure 7.'

Referring more particularly to the drawings and in the forni of theinvention shown" -in Figures 1 to 3, the numerall() designates HOLDER.

18, 1922. Serial N0. 537,392.

a stationary portion of a single acting press and 11 designates areciprocating ram or plunger of the ordinary and well knownconstruction, and which plunger is adapted to be reciprocated in theusual manner.

rIhe ram 11 is provided with the usual flange 12 and upon this flangeare mounted a plurality of pairs of superposed cylinders 13-14- Anynumber of these cylinders may be employed on both sides of the center ofthe ram, one set being thus disposed on each side.' As the constructionand operation ot each of the cylinders of each set is the same thedescription ot one will apply equally as well to them all.

Arranged within the cylinder 13 is a piston 15 and within the cylinder14 is a piston 16, each ot the pistons being provided with any suitablepacking arranged about their peripheries to form fluid tight jointsbetween the pistons and the cylinder walls. The pistons 15 and 16 areconnected by a hollow piston rod 17, which passes through the head otthe cylinder 13 and is open at its top to form communication with theinterior of the cylinder 14. The piston rod is also provided with anysuitable number of openings 18 adjacent the upper face ot the piston 15,so that the cylinders 13 -14 will have communication with each other b vmeans of the hollow piston 17.

The piston 17 is provided with a depending portion 19 which extendsthrough the. lower head of the lowermost cylinder 13 and also through asuitable opening in the flange 12. 'll`o the end of these dependingVportions 19 a-blank holder ring' 20 is connected in any suitable mannersuch as b v means ot fasteningA devices 21. Any suitable means may beprovided for limiting the movement of the blank holder ring 2()withrespect to the ram 11 in one direction such as bolts 22, which aresecured by one extremity to the blank holder ring', and which passthrough suitable openings 23 in the flange 12, to proj ect, therebeyondand the projecting end 24 of the bolts are threaded and adapted toreceive suitable Jfastening nuts 25.

Leading from the cylinder 13, beneath the piston 15, is an outlet 26which 'has communication with the atmosphere and through which openingany Huid which may be present beneath the piston l5 will be dischargedwhen the piston is moving towards the lower head of the cylinder 13.

`Leading from the cylinder 14, beneath the piston 16 is an outlet 27,with which outlet is connected a pipe 28, which in turn is connectedwith a pipe 29 having connecltion with a valve casing 30, the valvecasing being provided with an outlet 31 having communication with theatmosphere. Within the valve casing 30 is a valve 32 having passages 33and 34 therein.

Leading into the top of the cylinder 14, preferably through the upperhead thereof isa pipe 35, which has communication by means ofaconnection 36 with an outlet 37 of the valve casing 30. The valve casing30 is provided with another opening 38, with v which a pipe 39 hascommunication and this pipe 39 has communication with a pipe 40, whichpasses through a suitable stalling box -1-1and telescopes with a pipe42, which latter has communication with a supply pipe 43. The pipe 42 is'anchored upon the por- 4tion 10 of the machine by means ot' a suitableanchoring device or yoke 44, so that the pipe will remain stationarywhile the ram 11 is being reciprocated, and during such reciprocationthe pipe 40, which telescopes with the pipe 42 will be reciprocated withrespect thereto and will always maintain a con'nnunication between thepipe 39 and the supply pipe 43.

The valve 32 is adapted to be positionedl so that the pipes 36 and 39will be brought r into communication while the pipe 29 will be broughtinto communication with the outlet 31, leading to the atmosphere. Inthis position of the valve the 'luidenters the pipe 43 and iows throughthe telescoping pipes 472-40 into the pipe 39 through the valve casing30 and passages 34 of the valve to the pipe 36, from where it will bedelivered` through the pipe 35 intothe cylinder' 14 above the piston 16.A portion otl the lluid will 'low through the hollow piston rod 1T to bedischarged through the outlets 13 into the cylinder 13 above the pistony15. This will cause the piston 16 to descend with respect to thecylinders and thereby lower the blank holder ring. Anyfluid in thecylinder 13 below the piston 15 will be discharged to the atmospherethrough the opening 26, while any fluid in the cylinder 14 beneath thepiston 16 will be discharged through the opening 27, pipes 284-29,passage 33 in the valve '32,`\to the atmosphere through the outlet 31 ofthe casing 30.

The Huid is admitted into the cylinders above the pistons before the ram11 starts to descend so that the full pressure will be exerted upon thetops of the pistons 15 and 16. As soon as the blank holder, which iscarried'by the blank holder ring 20 contacts with the work the motion ofthe blank holder and blank holder ring will be arrested while movement.`of the blank holder and blank holder ring the ram continues in itsfurther downward This arresting of the movement which pressure isexerted upon the blank` holder, which is in engagement with the work.

After the operation of forming of the article has been completed theblank holder may be allowed to remain in contact with the work until theram has reached a redetermined point in its cycle of o'eration. At thistime, the blank holderl rlng then starts to recede and this recedingoperation of the blank holder` may be accomplished at any desired time.

If desired, however, the valve 32 maybe operated at any point in thecycle of opera tion of the ram 11 so as to cause pressure to be exertedupon the bottom of the piston 16 in the cylinder 14 to raise the blankholder ring and the blank holder away from the work so as to permit ofthe ready removal of the shaped article. By thus adjusting or causingthe blank holder ring or blank holder' to move away from the work inthis manner it will'be manifest that it is possible to draw a shell of adepth to substantially the full stroke of a single action press, byreason of the fact that the blank holder or blank holder ring will bewithdrawn sufficiently to permit the removal ot' the finished article. l

Any suitable means may be provided for actuating the valve 32. This maybe accomplished either by hand or automatically. It it is desired toaccomplish the same auton'latically there may be provided a lever 45,which is connected with the valve 32 and connected with the lever 45 isa link or rod 46, which may in turn be connected with any suitable partoi the machine. As the valve 32 is adusted so as to permit the pistons15 and 1G to be raised in the cylinders byfluid }.iressure the valvewill be positioned so that the port or passage 33 will formcommunication between the pipes 39 and 29, thereby directing the fluidpressure through the pipe 39 to the bottom of the piston 16; At the sametime the passage 34 will be positioned to establish communicationbetween the pipe 36 and the outlet 31, so that thelluid in the cylinders13-14, above the pistons 1516, will be discharged through the pipe 35,pipe 36, passage 34 and through the discharge outlet 31 in the valveeasing 30 to the atmosphere.

In the form of the invention illustrated in 4Figures 4 to 6, theprinciples of this invention are shown as being applied to a doubleacting press, in which 47 designates the blank holder and 48 the punchwhich carlength of the stroke.

ciprocable member preferably embodies a bottom and side portion.lThe'top of the fixed member and the bottom of the recipro cable memberoverlap each other and their edges respectively abut the inner faces ofthe sides of the other member so as to form a space or chamber 52therebetween, suitable packing 53--54 being provided to form" fluidtight joints. The,reciprocatingV members 51 are adapted ito besuperposed and are secured together in any suitable manner such as bymeans of fastening` bolts 55, arranged adjacent the inner periphery ofthe members. The fixed members 50 are also superposed and are adapted tobe secured together in any desired or suitable manner preferably bymeans of fastening devices or bolts 5G, extending through suitable ears57, and the cushion thus formed -is adapted to be secured to the blankholder 47 in any suitable manner preferably by means of fastening bolts58, passing through suitable openings in a flange L59 and enteringsuitable threaded openings GO in the uppermost member 50.

The draw ring 61 is secured to the lowermost reciprocable member 51 inany desired or suitable manner but preferably by means of clamps G2,preferably of an l. shaped formation, one edgel of which abuts the lowerface of the member 51 and the other edge overlaps a flange on the drawring (l1.Y The lowermost member 5l is provided with a groove 63,extending through its lower face into which groove the head G4 of a boltG5 is adapted to be seated. This bolt passes through the clamp 62 andreceives on its free end a lut (Stir It Will therefore be seen that whenthe blank holder cage 47 is reciprocated the draw ring 61 Will also bereciprocated and when the draw ring forces the blank against a die 63the movement of the draw ring 61 will be arrested but the blank holdercage 47 will continue to descend for the full The draw ring 61 iscontrolled by the fluid pressure so that the draw ring will be caused toexert a substantially uniform pressure upon the blank duringthe formingoperation. To that end fluid is supplied to the chambers 52 in anysuitable manner preferably through the medium of a pipe 67, providedwith branches G8, one leading to each of the chambers to interfere withthe reciprocating movement of the blank holder cage 47.

The ldie, in the form of the invention illustrated in Figure 4, embodiesa movable portion G9, which latter'is preferably s`upported by means ofpins passing through the bolster plate 71 of the press and the pins 70may be supported by means of a suitable cushion 72, common in machinesof this character.

In operation, the blank to be formed is placed upon the die 63 and asthe blank holder cage 47 and punch 48 descend, the draw ring 61 willcontat with the blank and co-operate with the portion 63 of the die forholding the blank in position. At the time the blank holder descends thepressure of the fluid in the chambers 52 Will be exerted upon themovable portions 5l of the cushion but when the draw ring 61 is arrestedby its engagement With the work, the reciprocable members 51 will becaused to more with relation to the fixed members 50, so as to gzip theblank between the draw ring and the die 63.' As the blank holder cage 47reaches the limit of its downward movement the -punch 48 continues inits descending moveof a greater latitude of movement of-the thethickness of the ring 7 3, so that when the ring 73 is raised by meansof the duid being directed beneath the piston 16 into the cylinder 14,through the opening 27. the ring 73 Will be moved in close proximity tothe face of the bottom of the ram and the portion 74 of the ram willproject into the opening in the ring as shown in dotted lines in Figure7. M

ln this form of the invention the bottom draw ring 7 'is supported bymeans ofthe pins 70 and the upper face of the ring 75 is vpreferablyadapted so that it. will normally stand slightly above the die block 76,which latter is secured upon the bolster plate 71'in the usual manner.

In operation and during the downward movement of the ram.11 the ring 73will be in the position shown in Figure 7, as it approaches the ring 75to engage and clamp the work, the Work being supported by the ring 75and extending across the die block 76. A further movement of the ram ina downward direction will cause the ring 73 to co-operate with the ring75 to grip the blank. The ring 73 is held in the position shown inFigure 7, by reason of the pressure in the cylinders 14 above the piston16, and this pressure is suficiently strong to cause the ring 73 toshape the blank over the die 76.. During this shaping operation and astheram 11 descends, the ring 75 will also descend against the pressureof the cushions 72 untilthe completion of the forming operation.

When the ram 11 begins to recede, the ring 75 will follow the ring 73and the shell which has been shaped over the die block 76 will bestripped orvremoved from the die block as the ring 75 ascends. lV henthe ringI 75 reaches the limit of its upward movement the shaped articlewill be supported by the ring 75 until the valve 3() has been operatedto permit the fluid in the cylinders 14 to bc discharged from thecylinders 14, through the pipes 35-36, 29-28, to the bottom side of theplunger 16. plunger 16 to: rise with respect to the ram 11, and with itthe draw ring 73 until the draw ring 73 has assumed the position shownin dotted lines in Figure 7. In this `position of the parts, when theram is elevated, the shaped article may be removed.

With this invention it will be manifest that a press of this charactermay be readily adapted to and effectively and eliciently draw or shapearticles of a depth to substantially the full stroke of the ram.

Any suitable means may be provided for shifting the valve 30, but asimple and eilicient means embodies a tubular member 77, which ispivotally connected at one end as at 78 with the lever 45, connectedwith the valve. Telescopi-ng with this member 77 is a rod 7 8,` which ispivotally connected asat 79, with a fixed portion of the press such asthe portion 10.

Adjustably mounted upon the rod 78 is a collar 80 which is adapted, whenthe ram 11 rises to engage, at a predeterminedpoint in the operation ofthe press, the end of the member 77 and thereby shift the valve 30 inone direction.

The rod 78 is provided with a slot or 'groove 81 having ashoulder 82 anda pin or member 83 projects into the groove or slot 81 and is'in turnconnected with a collar 84, adjustably mounted upon the member 7 7 Thiscollar 84 with the pin 83 is adapted to be so positioned upon the member77 that when the ram 11 reaches a predetermined point in rlhis willcause thev its cycle of operation, the pin 83 is engaged by the shoulder82, to shift the lever 45 and position the valve in the casing 30 so asto establish communication.between the pipe 36 and the atmospherethrough the opening 31, and also establish communication between thepipe 39 and the pipe' 29 so as to permit the fluid above the piston inthe cylinder 14 to be discharged to the atmosphere and to direct theincoming fluid to the bottom of the piston 16 to move the ring 13 intothe position shown in dotted lines in Figure 7.

With this improved invention it will also be manifest that the mechanismwill automatically adjust itself to compensatefor the varying-thicknesses of the sheets or blanks to be drawn or shaped and at thesame time a substantially unvarying pressure will be exerted upon theblank throughout the forming operation.

Furthermore it will be manifest that with this invention it is notnecessary to set the upper blank holder accurately as the upper blankholder may be set at approximately the proper position, after which theblank holder will automatically adjust itself according to the thicknessof the blank being operated upon.

lt will also be manifest that by the provision of a -luid pressure meansoperating upon the blank holder of al double acting press, the presswill be converted into a triple acting press.

It is sometimes desired or necessary in constructing or shaping certainforms, such as irregular forms to exert a different gripping pressureupon different parts of the blank being shaped and in order to accom#plisli this result it is necessary to maintain different pressures indifferent cylinders 14 or groups of cylinders, and this may beaccomplished in any suitable manner such as by means of a controllingvalve` designated generally by the reference numeral 85 in Figure 1, andthis valve is arranged in the pipe connection 35 between the cylinderand the valve casing 30.

While in Figure 1, a controlling valve 85 is shown as being applied toonly one of the cylinders 14, it is to be understood that a similarvalve may be vemployed in connection with eachof the cylinders 14 or anydesired number or groups of said cylinders.

This valve 85 preferably embodies a casing provided with a wall 86havingan opening 87 which is controlled by a valve 88, the,

latter being influenced by diaphragm 89. Acting upon the diphragm 89 isa spring 90, the tension of which may be varied by means of an adjustingscrew 91.

A pressure gauge `92 may be provided and the valve casing is providedwith an outlet 93, which is connected with the pipe 35 leading to thecylinder '14. Connected also. with the pipg-35 is afbranch pipe 94,which IUS lil)

has communication with a valve casing 95, the latter having an outletopening 96, discharging into the atmosphere. Within the casing 95 is avalve, 97, controlled by a spring 9S and the tension of the spring maybe adjusted by means of a suitable adjusting screw 99.

The tension of the spring 98 tends normally to hold the valve 97 seatedso as t0 cut oit communication between the pipe and the outlet 96 whilethe spring 90 is so arranged that it tends norm-ally to hold the Valve88 unseated.

In use the fluid under pressure entering the pipe 35 will flow throughtheopening 87 to be discharged through the opening 93 and into thecylinder 14.

Fluid-will continue to flow in this direction and thepressure willbeexerted in the cylinder 14 until a predetermined pressure is obtainedin the cylinder and this initial predetermined pressure is controlled bythe adjustment of the screw 91 to vary the tension of the spring 90,'and which spring 9() operates upon the diaphragm 89 in opposition to thefluid thereupon. When the pressure has reached a predetermined degreethe diaphragm 89 will be deflected, overcoming the tension of the spring90 and will close the valve 8S to-shut ofi any further supply of fluidto the cylinder 14, at the same time maintaining the pressure in thecylinder 14.

IVhen the piston 16 (s eeFigure 2) de scends the fluid pressure in thecylinder 14 l* may be controlledat will by the control of the valves 8Sand 97, the tension of ythe sprlug 98 being maintained atthe pressurewhich it is desired to open the valve 97. This construction permits ofthe obtaining of any desired pressure in any one oranore of thecylinders 14 or groups of cylinders and the pressure in these cylindersmay be controlled at will. I

While the preferred forms of the invenlion have been herein shown anddescribed, it is to be understood that various changes maybe made in thedetails of constructionv and in the combination and arrangement of theseveral parts, within the scope of theclaims, without depart-ingfrom'the spirit of this invention.` IVhat is claimed as new is 1. Amechanically operated sheet metal drawing press embodying areciprocating member, au'd means whereby the member reciprocation andoperable upon the top side of the work, and means for controllingthefluid pressureupon the blank holding means.

means embodying valve mechanism for conf trolling the fluid pressureupon theblank holding means by controlling the direction of flow of thefluid. p v

3. A. mechanically operated sheet metal drawing press embodying avreciprocating 'member-, fluid pressure blank holding means mounted uponthe said member and operable upon the top of the work, the said meansembodying a plurality of cushions, and means whereby the pressure of thecushions may be varied with respect to each other.

4. In a 'mechanically operatedsheet metal drawing press a reciprocatingmember,

`fluid pressure blank holding means mounted Cil upon the said member andvoperable upon the top of the work, the said means embodying a pluralityof' cushions, and means whereby the relative pressures of the cushionsmay be varied at will.

5. In a mechanically operated sheet metal.

drawing press a reciprocating member, fluid pressure blank holding meansmounted upon the said member and operable upon the top ce A of thewoi'lgtlie said means embodying a plurality of cushions and meanswhereby different pressure may be maintained in dif- Y, f

'ferent cushions.

6. In a sheet metal drawing press a form-` ing die, a reciprocating dieco-operating therewith, a plurality of blank holding mea-ns, meansadapting said blank holdingv means for'operation in opposition to eachother, and cushioning means individual to the said'blank holding means.

7. In a sheet metal drawing press, a forming die, a reciprocating dieco-operating therewith, .a plurality of fluid pressure blank holdingmeans, means adapting said blank holding means for operationinopposition to each other, and means whereby the pressure of said blankholding means may be varied at will with respect to each other.

In testimony whereof-we have signed ournames to this specification onthis 15th day of February, A. D. 1922.

RUDOLPH W. GLASNER. OLOF G. NILSON. l.

